826 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



and conical, bearing a tuft of three or four long colourless hairs, which 

 form a crest. The bottom cell is also colourless, and attenuated into a 

 long hyaline stem equal in length to that of the sporule. The intermediate 

 oellfl are coloured brown, and become at length rather opaque. When 

 mature the sporules are discharged through the rupture of the cuticle. 



It is found throughout Europe and in North America, also on leaves 

 of Rhododendron, Orange, Iloi/a, Magnolia, Smilax, Lager strcemia, and 

 Almond, but typically on Camellia. 



The only check is to collect and burn all diseased leaves. 



- . Syll hi. 4146 ; Cooke, Hdbk. No. 1401 with fig. 183. 



Camellia Scar. 

 Coryneum Camellia (Mass.). 



It must be confessed that some little mystery surrounds this parasite, 

 which has only been detected once upon living Camellia leaves. The large 

 blotched spots exactly resemble those which are caused in the Camellia 

 blotch, but in that species the conidia are crowned at the apex with three 

 or four long and spreading hairs, whilst in the present species the spores 

 are similar in form and size, but without any crest of hairs. This may 

 seem to be but a slight distinction, but it is the principal difference 

 between Pestalozzia and Coryneum. It may be possible that this is an 

 abnormal form of Pestalozzia Guepini in which the hairs are suppressed. 



The pustules are numerous on the whitened spots, splitting the cuticle 

 in a linear, triangular, or stellate manner, so as to allow of the escape of 

 the conidia. The latter are lanceolate (30x10//), with from two to four 

 coloured cells in the middle, and a small triangular uncoloured apical and 

 basal cell, supported at first on slender pedicels of the same length as 

 the conidia. 



The same remarks as to prevention apply as in the case of Pestalozzia, 

 if this is not really, as we suspect, the same species. 

 Grevillca, xx. p. 8 (1891). 



Camellia Black Mould. 



Macrosporkm Camellice (C. & M.), PI. XIV. fig. 15. 



Internally, and to the naked eye, this form of spotting the living 

 leaves of Camellia so much resembles that caused by Pestalozzia Gruepini 

 that even an experienced eye can scarcely detect the difference until the 

 microscope is employed. The silvery-white spots on the upper surface 

 are of the same size, usually half an inch, and there is a distinct brown 

 margin. 



The scattered dark points are small, but when magnified are found to 

 OdnaUl of tufts of brown or pale olive threads piercing the cuticle. The 

 threads an; flexuous (30 10 /< long), with cross divisions. Mixed with 

 or supported upon them, are the club-shaped conidia, with, at 

 (ir t, tlm e cross divisions, but at length double that number, with longi- 

 tudinal divisions, like a brick wall (50-GO x 15-25 /i). Downwards these 

 conidia are attenuated into the pale olive pedicel, the whole upper part of 

 the conidiuin being of a little darker olive. 



